Efficient dual layer interconnect coating for high temperature electrochemical devices

Publication: Research - peer-reviewJournal article – Annual report year: 2012

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Effects of novel dual layer coatings Co3O4/La0.85Sr0.15MnO3−δ on high temperature oxidation behaviour of candidate steels for interconnects are studied at 1123 K in flowing simulated ambient air (air + 1% H2O) and oxygen. Four alloys are investigated: Crofer 22 APU, Crofer 22 H, E-Brite and AL 29-4C. The reaction kinetics is followed by measuring the mass increase of the samples over time. The oxide scale microstructure and chemical composition are investigated by scanning electron microscopy/energy dispersive spectroscopy. The kinetic data follow the parabolic rate law. It is found that the oxidation reaction is limited by outward Cr3+ diffusion in the chromia scale. The coating effectively reduces the oxidation rate. Reactions and cation inter-diffusion between the coating and the oxide scale are observed. Long term effects of these interactions are discussed and practical implications for interconnect electrochemical performance are suggested.
Original languageEnglish
JournalInternational Journal of Hydrogen Energy
Publication date2012
Volume37
Issue19
Pages14501-14510
ISSN0360-3199
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 4

Keywords

  • Corrosion, Interconnect, Coating, Parabolic oxidation, Chromia
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